Displayed here are some of the key topology features and benefits for the LTC3128. The IC’s buck-boost topology operates efficiently from input voltages above, below or equal to the output voltage. The active cell balancer eliminates ballast resistors and balances even while charging. The device charges single or 2-stacked supercaps. The SuperCAP charging voltage Range is 1.8V to 5.5V. The Device Operating Range is 1.73V to 5.25V. The highly accurate average input current limit maximizes the power capability of the input source. The IC consumes less than 2µA of quiescent current from Vout when charged, saving battery run time.